全文获取类型
收费全文 | 10796篇 |
免费 | 1522篇 |
国内免费 | 833篇 |
专业分类
化学 | 5904篇 |
晶体学 | 29篇 |
力学 | 611篇 |
综合类 | 193篇 |
数学 | 4996篇 |
物理学 | 1418篇 |
出版年
2024年 | 9篇 |
2023年 | 33篇 |
2022年 | 80篇 |
2021年 | 101篇 |
2020年 | 155篇 |
2019年 | 207篇 |
2018年 | 207篇 |
2017年 | 306篇 |
2016年 | 370篇 |
2015年 | 565篇 |
2014年 | 707篇 |
2013年 | 917篇 |
2012年 | 747篇 |
2011年 | 793篇 |
2010年 | 736篇 |
2009年 | 804篇 |
2008年 | 831篇 |
2007年 | 758篇 |
2006年 | 676篇 |
2005年 | 639篇 |
2004年 | 542篇 |
2003年 | 540篇 |
2002年 | 353篇 |
2001年 | 328篇 |
2000年 | 292篇 |
1999年 | 258篇 |
1998年 | 214篇 |
1997年 | 184篇 |
1996年 | 137篇 |
1995年 | 86篇 |
1994年 | 85篇 |
1993年 | 55篇 |
1992年 | 54篇 |
1991年 | 45篇 |
1990年 | 25篇 |
1989年 | 25篇 |
1988年 | 29篇 |
1987年 | 19篇 |
1986年 | 22篇 |
1985年 | 29篇 |
1984年 | 32篇 |
1983年 | 19篇 |
1982年 | 31篇 |
1981年 | 31篇 |
1980年 | 20篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1977年 | 16篇 |
1976年 | 4篇 |
1973年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
101.
For linear statistical ill-posed problems in Hilbert spaces we introduce an adaptive procedure to recover the unknown solution from indirect discrete and noisy data. This procedure is shown to be order optimal for a large class of problems. Smoothness of the solution is measured in terms of general source conditions. The concept of operator monotone functions turns out to be an important tool for the analysis.
102.
Cai-yun Jin Cao-zong Cheng Yong-tao Jin Jing Li 《应用数学学报(英文版)》2006,22(4):607-614
Two two-function minimax theorems are proved.The concavity-convexity conditions of the twofunctions involve strictly monotone transformations and mixing of the values of the two functions,and aredescribed by the inequalities as upward and weakly downward conditions. 相似文献
103.
Generalized KKM Type Theorems in FC-Spaces with Applications (I) 总被引:1,自引:0,他引:1
Xie Ping Ding 《Journal of Global Optimization》2006,36(4):581-596
The class KKM(X,Y) (resp., s-KKM(X,Y,Z)) of set-valued mappings with KKM (resp., s-KKM) property is introduced in FC-spaces without any convexity structure. Some generalized KKM (resp., s-KKM) type theorems are proved in FC-spaces under much weak assumptions. As applications, some new section theorems and coincidence theorems are established in FC-spaces. These theorems generalize many known results in literature. The further applications of these results will be given in a follow-up paper. 相似文献
104.
本篇文章首先定义了向量变分不等式的严格可行点概念,其次在假设了映射是强(D)-伪单调的情况下,证明了向量变分不等式解集非空有界与其严格可行点存在的等价性问题,推广了在数量变分不等式上得到的相应结果. 相似文献
105.
Xi Nian FANG Jian Hua WANG 《数学学报(英文版)》2006,22(6):1819-1824
In this paper, we study the extension of isometries between the unit spheres of normed space E and C(Ω). We obtain that any surjective isometry between the unit spheres of normed space E and C(Ω) can be extended to be a linear isometry on the whole space E and give an affirmative answer to the corresponding Tingley's problem (where Ω be a compact metric space). 相似文献
106.
在实自反Banach空间,用补偿方法研究单调和Fuzzy单调广义非线性变分不等式,得到了几个解的存在性定理.改进和推广了Browder,Pascali-Sburlan,Zhang等人的各种结果. 相似文献
107.
Salvador Hernández 《Topology and its Applications》2007,154(10):2089-2098
Let C(X,G) be the group of continuous functions from a topological space X into a topological group G with pointwise multiplication as the composition law, endowed with the uniform convergence topology. To what extent does the group structure of C(X,G) determine the topology of X? More generally, when does the existence of a group homomorphism H between the groups C(X,G) and C(Y,G) implies that there is a continuous map h of Y into X such that H is canonically represented by h? We prove that, for any topological group G and compact spaces X and Y, every non-vanishing C-isomorphism (defined below) H of C(X,G) into C(Y,G) is automatically continuous and can be canonically represented by a continuous map h of Y into X. Some applications to specific groups and examples are given in the paper. 相似文献
108.
109.
110.
Thurston proposed that conformal mappings can be approximated by circle packing isomorphisms and the approach can be implemented efficiently. Based on the circle packing methods the rate of convergence of approximating solutions for quasiconformai mappings in the plane is discussed. 相似文献